Single-step-fabricated disordered metasurfaces for enhanced light extraction from LEDs.
Single-step-fabricated disordered metasurfaces for enhanced light extraction from LEDs.
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DOI：
10.1038/s41377-021-00621-7
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发表时间：
2021-09-06
期刊：
影响因子：
--
通讯作者：
Zhang S
中科院分区：
文献类型：
--
作者：
Mao P;Liu C;Li X;Liu M;Chen Q;Han M;Maier SA;Sargent EH;Zhang S
虽然全内反射（TIR）为许多重要应用奠定了基础，最重要的是光纤，它彻底改变了信息技术，但在其他一些应用中，如发光二极管（LED），这是节能光源的支柱，这是不可取的。在LED的情况下，TIR防止光子从组成高折射率材料中逃逸。材料科学的进步使得电子-空穴对产生光子的效率很高，这使得光提取成为LED整体效率的瓶颈。近年来，在半导体/空气界面处使用纳米结构将捕获的光子耦合到外部连续体，从而提高了提取效率。然而，用于光提取的尺寸与光波长相当或小于光波长的几何特征的设计总是需要复杂且耗时的制造，这导致实验室演示和工业级应用之间的差距。受闪电虫的启发，我们提出并实现了一个无序的超颖表面，用于在整个可见光谱中提取光，通过单步制造实现。通过应用这种具有成本效益的光提取层，我们将商业化GaN LED的外部量子效率提高了1.65倍，展示了全球节能和可持续发展的巨大潜力。
While total internal reflection (TIR) lays the foundation for many important applications, foremost fibre optics that revolutionised information technologies, it is undesirable in some other applications such as light-emitting diodes (LEDs), which are a backbone for energy-efficient light sources. In the case of LEDs, TIR prevents photons from escaping the constituent high-index materials. Advances in material science have led to good efficiencies in generating photons from electron–hole pairs, making light extraction the bottleneck of the overall efficiency of LEDs. In recent years, the extraction efficiency has been improved, using nanostructures at the semiconductor/air interface that outcouple trapped photons to the outside continuum. However, the design of geometrical features for light extraction with sizes comparable to or smaller than the optical wavelength always requires sophisticated and time-consuming fabrication, which causes a gap between lab demonstration and industrial-level applications. Inspired by lightning bugs, we propose and realise a disordered metasurface for light extraction throughout the visible spectrum, achieved with single-step fabrication. By applying such a cost-effective light extraction layer, we improve the external quantum efficiency by a factor of 1.65 for commercialised GaN LEDs, demonstrating a substantial potential for global energy-saving and sustainability.
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